Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c864884093bf2b937f9980dc87a7a9b6011ee32f29afae635a8c39f2d3a960' 
  AND token = 'MTXmdhhERQ6zAzct0h2aBUnGGJsqJyLq+dNiNGR6bgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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