Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a04f03477a4b0dfbd04bcc4ac8d945a2f40e6dd3240d515f050352dcb7ad5d6' 
  AND token = 'RbPEJRq7Kwvi5XQ7t8fsCHXy600mC5t3VzXcJVBT7oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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