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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '5596451aa36b083af3df4b83b182a479cc386bddca8df8ebed033046a2a58513' 
  AND token = '29dlJJ8rHnawt28jAlgu1XS2tiA0wuxTaOyZh3Mszwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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