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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '018fbcac2f18291b74e95dc683483787fba07047ab5c12faa7c042078c2e55a3' 
  AND token = 'ALKa13sSjQZibfawA73u6jGxEQySmHduy0sEa3s5acE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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