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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '93702a9f49d3fd047705ec76f3bf540c721f24973ad3782787099a934fc68aae' 
  AND token = 'ih1KHg+ofV960mGfNblDOpGganP3EDSY0hSBUy4gV8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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