Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae5853255e87f7d4fde1ea7395dd56ba8967f22e43a3ae60e08b4fe6fc61228' 
  AND token = 'ePtaW/MMgviWVRjyZLXqdyrnGpaQeSV8kRQ//cDIR54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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