Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f5b5e4e76cc49ea543da1bf7c1b74b169105d8a7b0f185d709f9e9425189a9' 
  AND token = '/pdw5i3rGko+lHoUOGD3+7SouTL6dGYZUnRiMYQLjKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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