Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c4523c2d9d071dc8341a288a200d7345f7026af4087af70d9910c1025e764f08' 
  AND token = 'o/JOU+4aIcbLG3bFfvc8RACToddVTWcvI9g+2qn8Qu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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