The Salon Beyond by Citibanamex is another lounge at MEX accessible via credit cards. In this case, I used my Citi Prestige card to gain access.
The lounge is just a large room with lots of comfy (but aging) chairs. There’s also a small area with dining tables. In terms of decor, the Amex lounge is nicer.
Like the Amex lounge, however, nothing is self service. But unlike the Amex lounge, no one offered me any food. There’s a small “buffet” with a sign that says that you’re not supposed to take things, so I just stared forlornly at a fruit plate before someone gave it to me. I believe there was hot food on offer made a la carte, as I kept hearing the word “chilaquiles” in other people’s conversations with the lounge staff, but I didn’t actually see anyone eating any hot food, so who knows. Perhaps if you speak Spanish, you can get access to other food.
Also, the wifi was slower in this lounge than the Amex lounge, so assuming you have an Amex Platinum card, I’d probably head over there instead of use this lounge.