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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0f2d96e98b7c799b560d2000454ceba40fbc2b6fdef6e6af7aff3b65f509da9d' 
  AND token = 'eBT7wSskJ9b+eAVKeGcx59Pr+/mqf9oBR9sHnASCcmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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