Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c1d5e4900f29143f5b09543e35727cd770bfd2b4fe56a80c704191ce760c8d' 
  AND token = 'qT9Iu2RPCB5RdqeB2Agxpx51xZ+XazkZIdfeF/Mtn/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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