Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '078ac38ee87def9e3bd8b6caf85a6296095a8c85a1d0ceef324267f3c6eace2e' 
  AND token = 'ZFL9QvQMyE7rC/I+6vmkD1bqCM500wm2Nw5Rvt+4QJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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