Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d333330b71a58512bf42bc6251f220f13617f77c24be829a2768cf01e071f3' 
  AND token = '1mxaN4TMgEIIl281OMx0/92c8IWwI14xewI7SHjlj5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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