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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '99bc2efa5bc62a1e3ae35cc54efeaa46041775c78de736d2f8b0d534cdea5e64' 
  AND token = 'q3RqQUdqm/lflTznCJiINPEE01oDb9SxJ1GDKe5g3zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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