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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4c1516c50cf418f72a965351c19f6804cc06fed94c8820d904ab27e8990d92d1' 
  AND token = 'OI5ync/PFiqJO29p8Zy6Gwvx4GvfD28MaOa1qhk6fc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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