Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e5202801da9cbbae9cae9bce48f1e99549e884a8b6810f54f19dd00e9a60f9' 
  AND token = 'YW9LN++Q3Z/GoV24WhaPCvfq+jYrEZhM+ST0wHrYbh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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