Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84b3588acc07f09a06a1812100d5ed8c876fdfa577f6f810a5bc9166a020fb4' 
  AND token = '3IPlNBWMZEcjzgu6/EPs8EQpTldWKrjjJlg7Q38aIsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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