Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890e60a49e8213d7d7f8f254e0f866a07e56d4f9cbce4c1e4cf3a5ed2afe1c0f' 
  AND token = 'xn44HDLHVvvazgd91PiLzSJpI+K8U9c0hOs7kvUhwZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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