Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4ab722d430f97a85fee65efa92d6f553e4f81a5eb2d0ddb458b356e17a8ea2' 
  AND token = 'YcVILAmwInK44o2CR8kCC1DvsI/58CmNjzSkLWT3gHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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