Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a99d1cefabbf7cb7e53f44ab21acd70d7afcc033dbfc24ed15e16320280d22' 
  AND token = 'wBDvJ9+MIWQtWzbJqkq/zPUc5DQ+zlxMNqUxg5nYRks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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