Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c52d9c5f30abe5b9d12071d0c57dfc8112a4400c3dc74bc0e996339628ff68' 
  AND token = 'dxV09EvknZdoaHed9juQQ14enn1oJrK+j4KM10XBkIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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