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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ab45194db4c69af6a1d7b84a6a71add25d02ac29223212c22557b53e8dda08dd' 
  AND token = 'TppS6u6NUWCFmyvEiVrXpSiKUsQHf8e/xrGHMXND3E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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