Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e3e7d543361c3a5a4b0dd164255ccbe4517f3f4fe98156f36a8939b856e7dd' 
  AND token = 'Gtnj8oiAHGOpWbhqhde80x8LvOdWQkwmlWEbiWh0Xmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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