Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5318b0129071dfc7d2722b20bc525bbc10f3313eb940f79f9dac56350fbc60b2' 
  AND token = '+eY/nvmH2n9bLYFIyO3ohEeitGRTrooT13QNHr9HWYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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