The API Keys & Browser page in Dojo shows your API keys for the current selected environment only. To select a different environment, use the dropdown in the upper left-hand corner.
Every Miso environment has two keys: a publishable key and a secret key. The publishable key can be used to send interaction data from your frontend code, while the secret key should only be used by your backend and never shared publicly.
From this page, you can also browse the Miso API and authorize your API keys.