Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4cf5eda8ed086ccdc8aef7b16babbd136ad7aecb03fd1223c85e9346f891a4d' 
  AND token = 'fWSTA6ecMaaWk25RyGsT6V4Af544z9HKlPr33MJT+ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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