Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dbaeb3dbfe91bb7540ded8fbcee8a12ed9c08a466aee5101cfa350a6c62b3df' 
  AND token = 'fCfN5fFzbfT3QVvnk3zQwIEWmcp5SLZwsLI5O+4gvKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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