SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba88ff02871f156f8b47cf30f66fbcb8768aa72a41cb695f5dd1706f2fb4564f' 
  AND token = 'IgPz5PV708jWTVZmtKT9S4+mkL5+iIHNHYZ9+R98XJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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