Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d58d8b102cf485048fceefd02c9724c06701588672cd353d27924d208f9e22' 
  AND token = 'rKoR8SmSnQQuOobcVDOa3VjHRK16GskB9gbayfWYjXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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