SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7f7f25fd877f13b99d5e4e7541224ed65d4c56a13a590007e486bb7e5250294d' 
  AND token = 'oHXBD4YO9UlftFZ+jiWkimugjCZgKKBLsztcASZpCWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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