Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1fb954888c66e4773f474cf51c47e6ec4f3006a596376ad482739a9be92b67a1' 
  AND token = 'YsKl23sIGezxPWWTpVSFcxuh9H7kCbImhaVqlcMzlfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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