Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37e894853b20792f34bbdd748d8c16c260b5d200191eba09241a5896435c11f' 
  AND token = 'BsyQgETWzuudNm0LDT9LbD04O4a/HTjXgZrJRp6yeAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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