Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabe2a823d142854d5b6af75d9cb7fe4772c77b9da5bafdd4f18d95c286ada08' 
  AND token = 'km9l8DSSZ3OPdagfVaaPlQeoJNVpOR8CRmbsKRFGxeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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