Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79152d3df57756f80013c21d468a2606f6d78d1f99f988e7afa548b83423e7b' 
  AND token = '04FTlK3mPDD1ml8b1zllX/ljD0HhQ5YmZdklF2LKDi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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