Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e277207c9855d0d203562b2579e3250b602013608ed01d3ff3007f56e0f370f' 
  AND token = '2C29+XJsuPlsFAdX9EasfikNOkl0VXbdEHFScDTp9ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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