Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f48cabf8b224db14508c1dd12b559a255af67831218516523c9f29716c63e85' 
  AND token = 'rLnlTaY2fUdkwgMRsA0ePj4qdpk1GSQyPoM9HHHhBgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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