Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7f454ae2b86ecd6ff46450ef6101b761eb8af7d3edbca555e727c540fc69e6a9' 
  AND token = 'DBcMVYKz87ciyzqdvsgbOYgSRZJAPkVlDs9SYWliAF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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