The honest answer is probably not, and almost certainly not in the way you are hoping. Conjugal visits, which are the only form of genuinely private time allowed between spouses in a prison setting, are available in only four states in the United States: California, Connecticut, New York, and Washington. Every other state has eliminated the program. If your boyfriend is not in one of those four states, marriage does not create any right to private time together regardless of the sentence length.
Even in states where conjugal visits still exist, they are not automatic. Inmates have to be in good disciplinary standing, housed at an appropriate security level, and meet specific eligibility requirements. Long sentences for serious offenses often carry restrictions that can affect eligibility.
The reality of marrying someone serving 33 years is that visits will happen in a supervised setting, typically a large room with other visitors and staff present. A brief embrace on arrival and departure is the extent of physical contact in most facilities. That is worth going in with clear eyes about. The emotional and practical weight of that commitment over three decades is something worth thinking through very carefully before making it legal.
That is not a reason not to do it. People make it work. But knowing exactly what you are committing to before you sign anything is the most important thing.