Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2abb9d062339331753757a67c6333292f98732846f2ce4a70148b11cf8e358' 
  AND token = 'Y4M5UsCg7MQnb3xYst8Ee4oQ4U8l45JXQ/sF4cx0GMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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