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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a91c340bd5a5f6719db86674c099fa09c7e7b7b1e4627742ca5f5a386e2dc8a3' 
  AND token = 'llNLGbxGZ61FFDa4j1qnfMvq+NUXAm57LKLvdDxmrrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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