Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9f24178277b855e88889241c6730dd7a7b8f559f3f5ae17a031cc51189c359' 
  AND token = 'XZXNXOzGQ7CmwQaR54dEvyquIjm3pp9btRVbBTnN4+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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