You took part in a bank heist and wait for your share.
Finally this message comes in:
uMZ6rvnaWF88YQmbHNk3QdoxMj1hPn_htiEbOkNYlTA= Loc: gAAAAABdw_LDAgmuZdvcVAV_E-ld96n06pZqAGwEs8mMNW58L-xrNJ90a45WZcJfQd1xOWJPZ_XfsSEXSfSD6epdp1B6d1nVZ7qQTbVAXr8X9irA5I0BGDc= I wait for you there.
Where do you need to go?
The first string is the key, the second is the cipher.
The second string is called a "token" and was created with the Base-64 format.
This encryption method guarantees that a message encrypted using it cannot be manipulated or read without the "secret key".
The "=" at the end indicates the format is in Base64.