Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b846c44ad56c37ef83134f52394167f67db30e9a16c474ee15d0b7f032c91a47' 
  AND token = 'qZgUzNw36z9Msm8bCGXGlC6dW1XQ2doValSzpaoyxZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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