Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77ade727edefab3e487c1e11bfec4a35f8449b41d96c3d4397170fe740cb3f9' 
  AND token = 'DX+cywWbyvM0cwp5u83Bg/3mQxKNGUvJfGG3f+iIm+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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