Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbfbd757af8ea41ce50a1d4d34eb3c4e9c070789c110d8eaf8e6a62cd5eb599' 
  AND token = 'u9TKGojFJAA3sYKTNGQK0j6LUk0QjR35QSfoLqjfsus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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