There are VOC-free epoxy coatings, but they are few and far between. The epoxy is inert once sprayed, but may offgas for a significant amount of time if it's not VOC-free.
If you are interested in using an epoxy product, ask for the VOC content. The closer to zero, the better.
For more information:
ReadOlga Alvarez's Q&A "Is there any way to "seal in" VOCs in floor paint?"