Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fbf04fc9d8d0fe4cdb8e3f6a4465e97ed683a8386b06010979ec353e643fb3' 
  AND token = 'dnpYQcI724bKCmoLSvxGdrWxiN30AEXniWTB9jNwi/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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