Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5496e7d1f9360dc48b662ff394a4908054aa3ce27a1430e6a9c6d9603014fd' 
  AND token = 'dFOsHoVW4mBJXdQCuiIswm56wKxiEiYylIvq9N+MhUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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