Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a78093b5fa65426b9bb21a25b8b40593078b44304378afad9f4589a3fce95a89' 
  AND token = 'c1bnz6g5miVMWylCvJy6HYyRm6xmd5w/a03SnhOE3Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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