Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7632a3d26dc6181715e693f33eebe4d871ecff55a81580882fdeb928369b447' 
  AND token = '/jT27fLrszZNHCgPQagvWCR0NW5pmU6A0ctHiT1IFfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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