Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd221681e04bdf799028f5fd88c4c523846b60b2e2adbba7b1de782ceecf565d1' 
  AND token = 'ZPSZxbSkbBj98wxLGwwK0UHugcIqENa+uzpt1r4bJ5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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