Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '39e1a546391f5cbf897149f8a61c4c796cd756a1536a5e80aeeca9af80077a96' 
  AND token = '9lf32cW6mYfLKV126Om+ikN9zmsjHAuHIawHPkwbViw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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