Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b1fe3d51756c20a24bdb6a31867d217b489641de3dc432222c4a84537545b3' 
  AND token = 'Zx8f7z6BJKs2zLUDSilvQbJcJ7CrXaqnbEbQKy4GT6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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