Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3778263453b61ea827e12582d8b0ca62dfeb820f79ceef8cee41583f8775e6' 
  AND token = 'AqwTD780Rc/0oOb89FjkpsjqQIWFm2qkArQRdtA0EWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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