Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5cc3d6053f2d9c322324cc23319700080a09315f31d096d323f9c21fe4666f4' 
  AND token = 'RJSn3Ss5wXi6f5OZuM9izPUkHyTOmD9oiJbYEn5qWpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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