Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812b588136041a8a43e5780dc8a8ac02134c64abe2a622a4103c8207a6c5dcf9' 
  AND token = '7tJmkjPGrYwS82qOcMx9KjQQ1g5GyF02h7QsrL2F4ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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