Hm, thats pretty weird. Maybe check if the email they sent you contained any information about how long the delivery may take. Also try checking your spam folder in case you havent emails form key sites sometimes get flagged as spam. If the key isn't their after another day I would consider making another support ticket and wait until they answer. Personally I've ordered one key from them and received after around 10 hours I wanna say it was. But then again it was for PC and not for console. Hope this kinda helps you and you get your key soon!
_________________Just your average guy with a love for post-apocalyptic games.