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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '38ad03eb7ccc7ea67740dbe78eb254ce1e3932b4ba86c7d082cc08ee9d7b5b63' 
  AND token = 'iGRb27BpUTZj9mTZp3nh2NsKsiZUdY4SPGJiHtAUnDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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