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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '55b9efbaf6cb0ca28c8c100b8937950cba7b5f45e4224a47274d0ca735dae710' 
  AND token = '1vj538FgWjwS+zXModPaR212g5bEO1cGOs4aZ6Bj3BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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