Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b07f2d2b9547d8dd657534ed2e154eefd885faa1514b3f7e3fbd3e6d3dc0949' 
  AND token = 'z6vgV6rsFuRjohg09RXFy9dPECdsPfKmqGnUqn6r6d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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