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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f37dee495a6afe6c46b8bf9ffc7bb60e667d0b97c4088c3051babd9ca8b9b6c4' 
  AND token = 'fn4txTwY6d8bXVmh/6QEPapP+xfpiqIzVbQTqMwdOdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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