Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aecc2931a70470761df9841ea9d6cfdce03e2cf1d1b1a6832c61a36fa37bff3' 
  AND token = 'rhe5mdf9X6j79+ldQiy4CM8xPge04rHF1iYokFVzR8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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