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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6623b5fb7c39d0dc84b569ee900c911479a972d2361146b4b8863cc48bf44db8' 
  AND token = '95S7TS9HY2wu9uamH77mJ3c2DJrFtUUJ1RxfuSG4SGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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