Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39246e7a62552a9b6e960ae8a704a98a2cea95f6d4fcf2cb523712e51b35eef' 
  AND token = 'T7HCgbml9h851pfmLg+s2UqEVFsVJ+8SL5Ta3MgOCww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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