Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389dae5cb2ee4972a3efb78d4acf979db664baae9963e408114a564287d52eca' 
  AND token = 'HPIaQe/MaWhr0P7BDUz0zoj/Api0rWKW0TLTB+wpuNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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