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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8d92f56a8543b98219495a920aba422625cc967319b0eca378e53f26f51f9c71' 
  AND token = 'FbLAt54eRqOzMAhli8q0JA4JU1nFNCwS1pyUvArsYXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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