SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e25b66723cc657b1c007b60754de71e5cece7687378ad49256fffb3bef873d2' 
  AND token = 'd/Nvgq4rGoLqlwZ9kKvZXvvGBt3UxWhOQmsgDeavAJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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