Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c01581ac529852bee1ace1401bf57849fbbcf84a6a8da023bdfab9d2f3faad' 
  AND token = 'KRDaJ6u25G0LwLu0aU0gG6CB7MUipMnHycuavR7brCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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