Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f17eeec501d76ff032de4ecdaacf12f2febeb6f42876e6b032351657857453' 
  AND token = 'P0fb/TfQfM4wln+jcBi/qvRd26gXX7/sYmansAnD3bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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