Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dae9bd9cfb5783e46b1d62239224d870eaaf5ad84aca267d02a85a4f20afeba' 
  AND token = 'iq8a5rjCN8lNyhlXQeyZCbjiM4vSSauDPZDQgmT9MPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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