Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37ec5ed8b6d0c86e6a4b897c4a4241fe4ef838ccec75f962086004b8fe484a1' 
  AND token = 'rg/dfyIiFwnCd068x8mqCb1t581jgLCoyJKNzABoWCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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