Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '749ef179d027741e769079ccaca7b414cc8ca3ca3d839f9c36be3160f7e4ec93' 
  AND token = 'cX5EwAwWMnOqpNkNnQToEUGh7xcKJ3BDu6x3/xYJm48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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