Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2450c2aa779ae75cbdc9b8fe92dd125e647ab9e9ef7c2806c2ab2ebbc05b34c3' 
  AND token = 'hC5UVhvAQxvp3mRIQfytYgb6MEA2I19AIvsejjg6ID4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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