Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f300d1ed5a16314ba1fbaffc35bedc1458b409347fdbed0c7010e8c2ebff57e' 
  AND token = 'ovc2hLyZ0dQY4NCMr1nFj6ggQGiFEVCXSgZ8xrSn4ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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