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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd4bc038710bcbbd210f01ab9cca1020d5d8018282cb3dd4117f064ae3bd41495' 
  AND token = 'kjtc9xeYOO8dU+E/jmATRYWp0TVyb2hrAe2RaajwtoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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