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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5003f81beb69d36f4a37b1dee24221f569d4257a4d31fb28454b3f078159eba5' 
  AND token = 'lIFFDrIEAeV6SuCd54NN/xGiXxh3mT+LuNpOea0Wf3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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