Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c088162b09cee83b7a24a337e8512a4d85345e6d6d41f68e1fe1ed7ffcfdf40' 
  AND token = 'WcxsxqGoGfrBcVkxsd5lGGZe7YxL85Sl0FO8tEIqllQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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