Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b761b6871833e0e19f59e929f53087f337fe7f4eabac8f7e9f8b1eb3d1b82d4' 
  AND token = 'R7RtBH1zBpu91/1DAyMT+394eO0nLo1iZcHCBaP9CmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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