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When you generate your encryption key it should be saved on the Downloads folder in your computer, if you have not moved it to another folder then, please search it there.
You will provide the de-crypt key when you need to access your data, for example, when you go to the submissions page for the form you've encrypted, then you will get a pop up like the one on the screenshot below asking you to provide the key so you have access to the submitted data:
If you have set up email notifications, then you will receive the email as normal, but when you attempt to view the submitted data you will get a message like the one shown below:
This way your data is secure and it can be viewed only when the key is provided.
Here is also a guide with detailed information about this, please take a look:
If you have any question, please let us know.