Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9559905b1c57c87b00209ecff67f2aa1f6e0b04aa7cbc623c8fbbc24039348' 
  AND token = 'VWyuMjV5rmJ7Axb3o+7P6stuDB3V7xSe4loj5mI0J+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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