SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '07a982efd562beeb2cfdab65a0c5b7f2ac6bc27faa0f41cd50e5826449f0742f' 
  AND token = '6hLg6Vl9zjOJD76dBIyHYKE8/I36QM7BK1MoBzlDFuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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