Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a486f2d4ab89c2bbda03a52b1804102c67930a542bcc36e6f7437b8f5955091' 
  AND token = '71mNMXb2N6LK40Ta5n2w6xysNVsGiQxhi+ObuEEdLmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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