Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308361098d36cbcf0224f16387caa01f5339de51761c321bf133851e5a429699' 
  AND token = 'imOOJvsh90aEKdwSr+iTyDdE9ra43GJpORf7FSoqu0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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