If you don't already know about Calibre, I wholeheartedly recommend it.

You don't even need to load the books into calibre's database to view it. You can invoke 'ebook-viewer' from the command line directly with the epub file's path as the argument.

There's even a console reader, if the reason for unzipping is reading in the text terminal: https://github.com/wustho/epy

emacs can be a surprisingly comfortable text mode epub reader too, via nov.el¹ which has been discussed here². If you use a GUI emacs build you get inline images and other goodies, but starting emacs with -nw can be a reasonable solution for quickly checking a book in a term.

Note: You don't have to be a full-time emacs user to use nov.el.

¹ https://depp.brause.cc/nov.el/

² https://news.ycombinator.com/item?id=21426315