Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540ba7f4956743a713541175e222148f1eb05b92c99b6b30d54460d077e16c14' 
  AND token = '8I0yT90chC8Wtg049UTpJjZyme4OdkkfuK1vnqKA2iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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