Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b544a5bee594761fee66c4a58e2ffa00a92af4b9f66bdc3c6d51ac61c8df6f8c' 
  AND token = 'qvt03dGqXddGtE8jqhJoUGVaYJoMlYh5WypKTfXU660=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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