Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68aaaeaf980277da9047d666d0a0457944a34b750c0a7e8189c238b0f12c452d' 
  AND token = '2tYNCVfKDu7cIs4kuOG6Wf6wputtfpF6wpMCTIv+Rio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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