Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347da2cd56e604c71087026882be73ac6cb27340774f34871f1d2713db415b3a' 
  AND token = 'MvoVsPiZnLVOLQcM3cT6nYxgqEFMiH+PG1bBPBxdY+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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