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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '48068538581ecf3c121c435a332c71435c893c7fdfae83b4ad52132dd14998e6' 
  AND token = 'a75Oh6NNvhFnETq3yIPTtI9nimj04icwahwjvhPCJTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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