Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9d9a18244c991ddacf36e7a80ca30edc988504287b26233be51a3699b14b571e' 
  AND token = 'SrD55Iy5iy6LIIFFx6jzx1B3b4P9AUAMT0V/nYTea3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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