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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9239d95a518f2ad4b9ab67e3f248c62cb1d453cfd5a19ae2055ee98e3a007b7e' 
  AND token = 'mASg0jmpn3Y/nkc3Dmuyh2eEmiAuo/JmZxT+tkiCaos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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