Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184ec5024e0361fca4f0608fab09ac7cfa5815af4804aa8e646f5248c7ebfe19' 
  AND token = 'RTOqUkFO4Zg8MmH0XrYCOUMY3iIQ14Eqizxmj9AeGyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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