Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321de0b8f620d11f0353b3a69d231c2c753bf5e3db652f1087248dff36e15f05' 
  AND token = '6hG44CTsdVuZNLnkAR22MCwX/mcyM54hlZZHuVRHEaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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