Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69c4cf8950175772467b5e8539132f5fabd30b9a07ddaeea2d89edd58ba58ff' 
  AND token = 'xCk/rnv/8dpevYSxmXDa8akz5KdStRPF7VgUpQVlsWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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