Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b9ef740dcb3a2679f8f188eb230eeb05ede3c4c81c444ee383a0b49a8516ecdd' 
  AND token = '/icneXQwwTAh4US9kauo1nlg0NyJ9qt9FN6IUiAAi5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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