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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c9055eeb33f8b83af161a383c6ae6e49b607b2f8738fb8d2fa8176a9c9782ee' 
  AND token = 'jiMDXZc7LwqvoECRfwoz9rDQMaXCB1eaZikoD19IjBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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