Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d0a97be7a30d8856de616df5466c920ff5b9f4ec3e54c429c5e2e345c30684' 
  AND token = '6W9ErjpSwkIUQQV4VIpOwjKOKzVDwxVG8BxLw7hipsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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