Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4a143454c29584c876e0ce36fa69d312fe8c09ff6e04db5e4dca71a736e658' 
  AND token = 'rc1NzVzut3fIoqZ6nflhMWniSYnpccAMXgMM3tbPal4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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