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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f85b86f993798f021f469503af12ae307870693de4617db92de5fc7e37ac1fd2' 
  AND token = 'B0/1Z7cRKgkgiLJRQSIwibe9xe/9OMJLr7GXf4Ui9LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}