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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '690ddf9455a585249a6cd913d988c3a18ca0a9a7a53abf6066c634c7621c3400' 
  AND token = 'hbj5oM1l3N0JarGYxqQs+y5xKtdRrq+CfuQ3ztSO4mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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