Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffc23d2a8efa22bdc68c620701868943bcb8bc38a7f4be3866a4a7e28ddfae0' 
  AND token = 'ZM/D7ZL2vBzYA3Q94vwufGMWlERaauWjR2GKy9FErFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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