Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b65a1c2d9b760788b235f07bf795d2717f4e89feae8c8d3ec1267c6050dc8e84' 
  AND token = 'uT+9WXfVx1SvWAxarLd2CoVj9SAchY/hCKjjy5gyyeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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