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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4f61010fa1200d315c2bf6a9807ab10245de87e7c52bed8c60dcad25f0555eb5' 
  AND token = 'JfXULcHnuHgFeFJX/TfoLUW1MSCBnAlWoN/F7H81CDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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