Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d97ca3d1c0f737d21ce3cc7aaaf666a351a4f42d7478ed3943bf9c59b2ec11' 
  AND token = 'uTlMRsEVhR0bWcouBwwQhmqQim8iuAsNQhuFrbW8nmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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