Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f36d4dc8237d7e69a383d33086ea6f6faeb81bd5fa0a3e32eefa3ccefec4f8' 
  AND token = 'k1P7AuBc6yV703+SG7StS89ItPth9L1VCEmLL7JAdKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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