Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1ca6527229893d67dfcf2306b9fcff281d772620655357b635772eb0433581ec' 
  AND token = 'W1T4MCGeJd/yFhT27ESkKcDVwQ9v6lCBbd6l+6UjckQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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