Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6858adc46d692c9a3fd1bd2a034f7741434272a23934a60e4065beb00a103b9f' 
  AND token = 'q3QTb75+66TWCw0Xjj9TQ0UVUt5zzcvrBpIAGvXAPoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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