Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d64fcacaf7f55afcf3fbce4976d7e5958a304bbfbb644ee4908ea2b5fd91208' 
  AND token = 'nzJw1R3pBESmyFMErzdJpM1qwb//fEq/zBijeXWDU8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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