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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4dafed6717a8cf41d7aaa452885f893c6d913beb007b3ac01da1eb499d809944' 
  AND token = 'c9Cz0/P9kL9/yeayZiEcMhFmFHLXvYvxgU5LWQ+3RRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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