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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'cf4422a378bfe27e91fbbdd2e17d4a7b0a71a74d35b10a204d9e4e1fd56de096' 
  AND token = 'jRMI4ENhmMWv8mGI8a7L0LzgwtOltUs9kDJXsyDwTXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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