Yeah, not a steam key, it's attached to the "world of" launcher.
I also noticed for the World of Warships unlock it specifies Tier V to Tier X ships only, so it looks like that one is only available for people who have played WoS for a while. Anyone new should do World of Tanks instead.
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It took multiple wins, but I eventually got a pop-up in-game stating that Master of Orion had been unlocked.
It didn't show in the Game Center (despite several reloads) until I hit the refresh icon next to "Install Wargaming.net Games", however.
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Oh boy, you're in luck today, as you can do it here: https://store.steampowered.com/app/298050/Master_of_Orion/
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You can earn the "new" Master of Orion + DLC by winning one game within World of Tanks or World of Ships.
The game is very likely NOT offered as a Steam key, but as a download via their client.
https://worldoftanks.com/en/news/missions/master-of-orion-0420/
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