Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c6c14eaf4c1cafd0ef790ecb5b239f3d1b2d81b81dadc6688c48f51e001ab4' 
  AND token = 'QS0OvVPXrPY/UtrqhJkZR7uzcIbhgd9USuJHN5824rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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