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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd35b9b3a7295171b82c27dd00daded6ee34e5a1e464d4904a777f37948874fb8' 
  AND token = 'Ko8wY30ycz/mPFK43yLdxDU7UhItldHjM4/YToue6F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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