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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '049c6532829ba7a43479550dc139d9195ca0bda4ad65719d75f86ddad1b73ac3' 
  AND token = 'OT917GtAX8W/kPjEjLchCM/1deJBQV1VtSygX1vZ1ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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