Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311a284bd135218559f9628d9bf9f355665777736f68c1a8a93c1d2772a05628' 
  AND token = 'EswYP+EEXh0gTLWkThdECJpbqIjVxaY0bkoTQ5dWpQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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