SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '75fd75ef99516e5a8d8a21fc57ec950f948b53bb7d1c5379b549e4d49df722db' 
  AND token = 'MlFK2HFGU5Rhy3hqG42l+TQQ47tGx/jYFsN7WlazDqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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