Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ea25885132a8d49ec4afbd29bbfb6a9335d1d9a2cc7add13439ce80abc4210' 
  AND token = 'vVR8yAFdJVqdHLIWsWOLuFB+fbfU3mK7SSJyLc/Bn0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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