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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd5687c1599e5d056b597b6281bad94674141a82cc486617ef238eda36f2d1a43' 
  AND token = 'bLhj6JYOaY0yHRrlHn3M+SphTdf9NMp0Wu0Lwq7+IlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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