Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eee29a6abc6c7c27b01ebb5f5d3b463ed96ef1eb0fe0a08b89f94bc378c62ac' 
  AND token = 'edwOfsNDjNgzNrb2NyLcIOmSxeQWIY0JkYLnLA+LRr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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