Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd411c1d14299dbfa17deef483373d10b80a7f373a43d3a7c63e6b86c4750321' 
  AND token = 'frZmXbv6o4OibGVB2ofN9kE3Z6Q8GHhZSyVch44vou4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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