Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8ef07b6e9b7b3e7f5f831ef287b903534f1702f04ebef02579b4dc54e3efa0d1' 
  AND token = '0Mvh7hOS7U6Nn2Mnyu9jcqj8huaMgeanc6BtCBanbYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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