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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd5a325042d5d60b38a6a4e942322e178899ab5a83f8ae6b676764223afb02708' 
  AND token = 'hdUubSOMo/2lSvQAoxHV+YDkbI9QvAJ0hIfjzmchIf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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