Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f68928e88f7fe90fcd761c6a4558e6ae54b24aeccd2a9ea72ba9f6302898504' 
  AND token = 'waXzIorX+ScbnFWFV9CKS5IxcwH50wH6aJSi4jFUFmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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