Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988175c908c24f819af0e85151556a2f65fc5a566ac6eae0ef370a2ee5da388d' 
  AND token = 'k8InJ5jYhLcuZ1w3YHZDayvUwLhPlfjCQDQHlfFgIUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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