Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8407660998bfe52fee4c37e5fac0dfa3bc84f2a3f638e090c28aba4749bc7c' 
  AND token = 'FjosxaKnF5tRbFe+5Vl7zrENcRrM01Jy8WuVOP+h71k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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