Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5949c9d064d2cbda11d9dc9385f4446e427b3994ff218b3fee53743b1ee004' 
  AND token = 'rvIsmD7XR6rYhybL6/e4x2Md8hyMzrC560M3c/Zud0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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