Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e63e9bccdb8dcb4faae12bc251924bd001165b0df230228279cb8e79e05cc2' 
  AND token = 'QS4GFxN45XD2WuLyA/XBtTRg0IbnKrOwGlceg/3MzZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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