Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c258ad8c7e8c1f3ee3674131763e5dca5cd4eb4110981904ae45d3b7cae96efd' 
  AND token = 'zO269e7u6GEjHOyQsbn5NH+CiswVEiemCWkfwdeP/hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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