Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4c753eddc200fee2c10edbbc2f5d6faaccc96d8719b2fcfda0777e4b3852e511' 
  AND token = 'AhTZSvNg+5IR3ise9W4ZAMEK89gvCHSZOsxxDH/1Gak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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