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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd9eeb8cf58529c3d2368ac015700b043431b633bd7c7823134d313a50820a58f' 
  AND token = '3PtEVUf0/EAnro0UwFoSUdQvdUmjl5/dCF6PPp3yGRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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