Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df6b6f2b3e21c2531ce0180240fbdb5aea3e2231084c4aa606560da77ead9b4' 
  AND token = 'QWqE5SPmVZ0yXKuJAPqZQzzvoVJm64FjEbaV4rs9pHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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