Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64be0fbb71800d342ef45a076d7d4fbfaad1b8bd6fc575feac9a72e2dbc8273' 
  AND token = 'hKUtmBnJQgefLUjGltWXJagYjKwHYhjAnTZN7NWkT7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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